[PATCH 8/8] Add support for backlight regulation on Acer n35
Ben Dooks
ben-linux at fluff.org
Thu May 6 20:35:04 EDT 2010
On Thu, May 06, 2010 at 03:24:15PM +0200, Pinkava J. wrote:
>
would a description here hurt?
> Signed-off-by: Jiri Pinkava <jiri.pinkava at vscht.cz>
> ---
> arch/arm/mach-s3c2410/mach-n30.c | 57 ++++++++++++++++++++++++++++++++++++++
> 1 files changed, 57 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-s3c2410/mach-n30.c b/arch/arm/mach-s3c2410/mach-n30.c
> index f25275e..4c37c71 100644
> --- a/arch/arm/mach-s3c2410/mach-n30.c
> +++ b/arch/arm/mach-s3c2410/mach-n30.c
> @@ -23,6 +23,7 @@
> #include <linux/input.h>
> #include <linux/interrupt.h>
> #include <linux/platform_device.h>
> +#include <linux/pwm_backlight.h>
> #include <linux/serial_core.h>
> #include <linux/timer.h>
> #include <linux/io.h>
> @@ -352,6 +353,60 @@ static struct s3c2410fb_mach_info n30_fb_info __initdata = {
> .lpcsel = 0x06,
> };
>
> +static int n35_backlight_init(struct device *dev)
> +{
> + gpio_request(S3C2410_GPB(0), "Backlight PWM");
> + gpio_request(S3C2410_GPB(1), "Backlight power driver");
> +
> + /* set GPIO as output for timer */
> + s3c2410_gpio_setpin(S3C2410_GPB(0), 0);
> + s3c2410_gpio_pullup(S3C2410_GPB(0), 0);
> + s3c2410_gpio_cfgpin(S3C2410_GPB(0), S3C2410_GPB0_TOUT0);
> +
> + /* setup backlight power driving GPIO */
> + s3c2410_gpio_pullup(S3C2410_GPB(1), 1);
> + s3c2410_gpio_cfgpin(S3C2410_GPB(1), S3C2410_GPIO_OUTPUT);
I'm going to hold this one pending the merge of the gpio updates, since
these calls are going away.
> + return 0;
> +}
> +
> +static int n35_backlight_notify(struct device *dev, int brightness)
> +{
> + /* power off backlight, values less than 12 ar useless */
> + s3c2410_gpio_setpin(S3C2410_GPB(1), brightness > 12 ? 1 : 0);
> + return (brightness > 12 ? brightness : 0);
> +}
gpiolib calls here please.
> +static void n35_backlight_exit(struct device *dev)
> +{
> + s3c2410_gpio_cfgpin(S3C2410_GPB(0), 1/*S3C2410_GPB0_OUTP*/);
we have constants for generic output...
> + s3c2410_gpio_setpin(S3C2410_GPB(1), 0); /* co stim */
gpio_set_value().
> + /* power off backlight */
> + s3c2410_gpio_pullup(S3C2410_GPB(1), 0);
> + gpio_free(S3C2410_GPB(1));
> + gpio_free(S3C2410_GPB(0));
> +}
> +
> +static struct platform_pwm_backlight_data backlight_data = {
> + .pwm_id = 0,
> + .max_brightness = 100,
> + .dft_brightness = 50,
> + /* tcnt = 0x31, FIXME: compute some nicer value */
> + .pwm_period_ns = 3*1000*1000,
> + .init = n35_backlight_init,
> + .notify = n35_backlight_notify,
> + .exit = n35_backlight_exit,
> +};
> +
> +static struct platform_device n35_backlight = {
> + .name = "pwm-backlight",
> + .dev = {
> + .parent = &s3c_device_timer[0].dev,
> + .platform_data = &backlight_data,
> + },
> + .id = -1,
> +};
> +
> static void n30_sdi_set_power(unsigned char power_mode, unsigned short vdd)
> {
> switch (power_mode) {
> @@ -395,6 +450,8 @@ static struct platform_device *n35_devices[] __initdata = {
> &s3c_device_rtc,
> &s3c_device_usbgadget,
> &s3c_device_sdi,
> + &s3c_device_timer[0],
> + &n35_backlight,
> &n35_button_device,
> &n35_blue_led,
--
Ben
Q: What's a light-year?
A: One-third less calories than a regular year.
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